Detective Comics, Vol. 1 #837 (Cvr A) (2007)

Honor Among Thieves
The Riddler has gone legitimate since his release, trading his intellect as a private investigator for hire. But life as a former super-villain has consequences, principally in a lack of credit. The need to pay for everything in cash means he has to constantly drum up new business. Like Bruce Wayne. A WayneTech employee has absconded with her project, and Bruce offers Nigma a generous paycheck to find her and retrieve her research. But will the temptation to keep what he finds prove too much for this former thief to resist?
Release Date: 2007